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Emissions of polycyclic aromatic hydrocarbons from batch hot mix asphalt plants

机译：间歇式热拌沥青设备的多环芳烃排放

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This study was set out to assess the characteristics of polycyclic aromatic hydrocarbon (PAH) emissions from batch hot mix asphalt (HMA) plants and PAH removal efficiencies associated with their installed air pollution control devices. Field samplings were conducted on six randomly selected batch HMA plants. For each selected plant,stack flue gas samples were collected from both stacks of the batch mixer (n = 5) and the preheating boiler (n = 5), respectively. PAH samples were also collected from the field to assess PAHs that were directly emitted from the discharging chute (n = 3). To assess PAH removal efficiencies of the installed air pollution control devices, PAH contents in both cyclone fly ash (n=3) and bag filter fly ash (n = 3) were analyzed. Results show that the total PAH concentration (mean; RSD) in the stack flue gas of the batch mixer (354 mug/Nm(3); 78.5%) was higher than that emitted from the discharging chute (107 mug/Nm(3); 70.1%) and that in the stack flue gas of the preheating boiler (83.7 mug/Nm(3); 77.6%). But the total BaPeq concentration of that emitted from the discharging chute (0.950 mug/Nm(3); 84.4%) was higher than contained in the stack flue gas of the batch mixer (0.629 mug/Nm(3); 86.8%) and the stack flue gas of the preheating boiler (= 0.112 mug/Nm(3); 80.3%). The mean total PAH emission factor for all selected batch mix plants (= 139 mg/ton(.)product) was much higher than that reported by U.S. EPA for the drum mix asphalt plant (range = 11.8-79.0 mg/ton(.)product). We found the overall removal efficiency of the installed air pollution control devices (i.e., cyclone + bag filter) on total PAHs and total BaPeq were 22.1% and 93.7%, respectively. This implies that the installed air pollution control devices, although they have a very limited effect on the removal of total PAHs, do significantly reduce the carcinogenic potencies associated with PAH emissions from batch HMA plants.
机译：开展这项研究的目的是评估间歇式热拌沥青（HMA）厂中多环芳烃（PAH）的排放特征以及与其安装的空气污染控制装置相关的PAH去除效率。在六个随机选择的批次HMA工厂上进行了现场采样。对于每个选定的工厂，分别从批次混合器（n = 5）和预热锅炉（n = 5）的两个烟囱中收集烟气样本。还从田间收集了PAH样品，以评估直接从排放斜槽排放的PAH（n = 3）。为了评估安装的空气污染控制设备的PAH去除效率，分析了旋风粉煤灰（n = 3）和袋式除尘器粉煤灰（n = 3）中PAH的含量。结果表明，分批混合机烟道气中的PAH总浓度（平均值； RSD）（354杯/Nm(3)；78.5%）高于排放斜槽排放的总PAH浓度（107杯/ Nm（3））。 ； 70.1％）和预热锅炉烟囱烟气中的烟气（83.7杯/ Nm（3）; 77.6％）。但是从卸料斜槽排放的总BaPeq浓度（0.950杯/ Nm（3）; 84.4％）高于分批混合器烟道气中的BaPeq浓度（0.629杯/ Nm（3）; 86.8％）和预热锅炉的烟气（= 0.112杯/ Nm（3）; 80.3％）。所有选定的批次混合工厂的平均总PAH排放因子（= 139 mg / ton（。）产品）比美国EPA报告的鼓式混合沥青工厂的平均PAH排放因子高得多（范围= 11.8-79.0 mg / ton（。））。产品）。我们发现已安装的空气污染控制设备（即旋风除尘器+袋式除尘器）的总去除效率分别为总PAHs和总BaPeq的22.1％和93.7％。这意味着尽管已安装的空气污染控制设备对去除总PAH的影响非常有限，但确实会大大降低与批次HMA工厂中PAH排放相关的致癌能力。

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